if you will be doubling or triple sawaring and also if there is some pahar charhai uthrai then the best suggestion is to reduce front sprocket teeth takay torque bar jaya our charhai char sakay ..
13 teeth sprocket is available for 70s but i think 12 teeth may be available ..
also if its 1000meters above sea level then you also need to lower the main jet .. i think hero ma 83 ka main jet laga hotha ha ? please check it and tell me .. you will have to carry few main jets and a couple of pilot jets .. so if your bike is losing power and spark plug is black oily or soothy thne just decrease the jet number and down the needle in the carb .. (i.e. raise the c clip to lower the needle .. go one step at a time)
if u are interested in more engine tuneups.. then there are both many possibilites and also little things to modify depending on your mode ..
but with triple sawari and such a long tirp i wont recomend any more mods